Shock absorber



June 5, 1928; 1,672,203

W. P. DAY

SHOCK ABSORBER Fi'led'Oct. 1, 1926 2 Shets-Sheet 1 June 5, 1928. 1,672,203

W. P. DAY

SHOCK ABSAORBER Filed Oct. 1, 1926 2 Sheets-Sheet 2 t .A/Z K MM. 4 M j w, m q n 55:55 W/ V w OJ Z 'I/IIIII/I/II \\\\\\\\\\\\\\W &

M 0 M 0 W WIIIII/I/II Patented June 5, 19528.

WILLIAM 2. DAY, or CLEVELAND nmon'rs, 01110) snocx ABSORBER it This invention relates. generally to'shock.

absorbers employedin connection with automobiles to restrain or relieve the rapid rebound of the vehicle and its axle. The ob-jectofthe invention is. to provide an exceedingly simple inexpensive. and eflicient device which can be quickly and easily. attached to automotive vehicles in. use and which will effectively retard the return! movementof the parts and thereby avoid the disagreeable shock or bump which would otherwise occur in the passage of the vehicle over uneven ground. I

With these o--. 'ects in ,view the invention consists in the novel featuresof construction and inthe manner of combining and arranging the same all of whichwill be described hereinafter and set forth in they appended claimsa j f In the drawing forming part of. this specification Fig. lis a view showing the practical operation of my invention, the cover being removed; :Fig. 2. is a vertical longitudinal sectional view; Fig. is a transverse sectional. view on the line;3 3 of Fig". 2;

and Fig. 4. is a sectional elevation. I i I In carrying. out my invention, I employ a back plate orv casting Awhich isv connected to the member B of the motor vehicle frame, said back plate or casting being preferably constructedwith an inwardly. projecting lug A which is adapted to rest upon'the member B and this casting orplate A isalso provided withia boss A -through which a fasteningv bolt is passed for the purpose of rigidly securing the casting or plate A to the vehicle frame. 7 This plate. or. casting A is preferably circular in shape and connected thereto at its center is an outwardly projecting post or bolt C which may be formed with an enlargement C intermediate its ends and connected to this cylindricalienlargement is the inner, end of a" convolute spring D, this spring being coiled a number of times around said centrally disposed post or bolt and. at itsfree end 'is connected to a clevis E and tothis'clevis E is connected the upper end of a strap F preferably of fabric but it will of course beunderstoodth atthe strap may be of any suitable material. The lower. end of the strap clevis G vwhich in turnis rigidly connected to the front axle Theconvolutesprmg isconnected, to a is contained within cylindrical shaped casing Ifcomposed of two similar l0ngitudi-' nal sect-ions, said. sectional: casing turning freely upon the central post or preferably provided with bushings. I".

A spacing'collar or, Washer I is preferably interposed between the inner side. ofthe cylindrical casing and the plate or casting,

bolt and 3 is I A anda nut I screwed uponthethreadedlh portionof the post or boltserve to, holdthe, I

twolongitudinal sections of the cylindrical casing: together, a washer If being interposed betweenthe nut and outer side of thecasing.

The clevis E projects through notches cut in the opposed edges of the sections of the cylindricalcasing, Y i w 'I By having. one end ofithe strapconnected toithe end, of the spring and the other end of the strap connected to the aide of the vehicleit. is obvious that when, the vehicle body moves toward said. axlepthe' tension ofthe spring will tend to take up the. slack in the strap and on the reboundthe strap will pull against the spring andhtend to wvind the same. upon thecentral postor. bolt and at. the sanietime the. cylindrical casing will; be causedv to turn an amount, equal. to the. movement of'theclevis inasmuch as. the said cle'vis projects outwardly: from the oylindrical surface. of the casing resting in notches. and consequently when the clevis is moved the cylindrical casing must. neo es sarilyturn with it. i

In order to prevent too suddenareturn movement or in other; words to absorb the shock. on the rebound, I employ a brake shoe K. pivoted at K. to the back. plate. or castingtand having. aleat-her or fabric'face K which'contacts with the cylindrical surface of the casing I. Inpractice the brake shoeK is carried betweenparallel side members K and rollersK are arranged at each end these-parallel members at opposite ends of the brakeshoe K,the-str ap F, passme; over and contacting with these rollers and brake shoe serves to. hold the face of the brake shoe in, contact With the cylindrical surfaceof the a. casing and. owing. to the-relative positions of the strap vendsand the brake .sh'oe, it will benoted that uponftherebound the initial, tensionvv isplaced uponv the brake shoeapplying a brake to the'exterior of the d a n it e se a time. at he en ehflt spring is exertingtension upon the opposite end of the strap' In this manner the rely improved.

I I have shown the brake shoe pivoted at K at the point aboutGO". above the horizontal but it will be understood that it can be arranged at other points and for the purpose of adjustment the back plate or casting 1s provided with a plurality ofbolt openings K to accommodate the pivot bolt of the brake shoe. If desired a housing 'L of thin sheet metal may be employed to enclose the operating parts of the device and when such a shell 0r housing is employed it is provided with acentral opening through which the outer end of the central bolt or stud C projects'and upon which a fastening nut and Washer may be secured. The use of a convolutev spring and cylindrical casing with astrap wound thereon has been employed. but it has been found that there is not sufiicient retardation in the operation during the rebound and consequently with the object of providing the proper retardation at all times, I have devised the curved brake shoe and arrange the same in the manner set forth relatively with respect to the cylindrical casing and the tension of the connecting strap and by so doing provide for'the proper retardation but at the same time permitting the free and gradual return of the parts to their normal positions through the rebounding action.

' The parts are'of such a simple nature that there is nothing to get out of order and they can be quickly and easily assembled and when once installed need no further adjustment, depending as they do upon their relative positions for the correct and efficient op eration of all of the parts.

Having thus described my invention, what I claim is V 1. In a shock absorber, the combination with a strap, of aback plate, of a cylindrical casing carried by said back plate and containing a convolute spring, one end of said strap vbeing connected to said convolute spring, the other end of said strap being connected to the vehicle axle. and a brake shoe pivotally secured to said back plate and arranged between the cylindrical casing and strap and adapted to be brought into frictional engagement with said cylindrical casingby said strap as set forth.

2. In a'shock absorber, the combination with a back plate, of a rotatable cylindrical casing carried bysa'id back plate and'con taining a convolute spring the inner end of which is rigidly mounted within said casing, of a strap connected at its upper end to the outer end of said spring the lower end of :said strap being connected to the vehicle axle, and a brake shoe pivot-ally secured to said casing and arranged in proximity to the cylindrical surface of the-casing and adapted to be brought into frictional contact with said casing by tension of saidstrap,

3. In a shock absorber the combination I with a back plate or casting having an outthe lower end of said strap being connected to the axle of the vehicle, a curved brake shoe pivotally mounted on said back plate and interposed between the cylindrical surface of the casing and'the strap, said brake shoe being brought into frictional contact with the cylindrical casing by the tension of the strap. i

' 4-. In a shock absorber the combination with a casting having a spring actuated r0 tatable casing mounted thereon, of astrap connected at its upper endto said casing and at its lower end to the vehicle axle, and

a brake shoe pivotally and adjustably connected with said casting and interposed between the cylindrical surfaceof the casing and said strap and adapted to 'bebrought into frictional contact with the casing by the tension of i the strap.

5. In a shock absorber the combination with a casting I having a spring actuated cylindrical casing mounted thereon, of a strap connected at its upper end with. said casing and at its lowerend with the vehicle axle, a brake shoe having one end pivotally secured to said casting and interposed betweenthe cylindrical casing and the strap, said brake shoe being so positioned with reference to the ends of the strap and the cylindrical casing that said brake shoe will be forced into frictional contact with the cylindricalsurface of the casing uponthe rebound movement of the parts and whereby the proper retardation of the parts during ing, its lower end being connected with the,

vehicle axle and a clevis connecting the upper end of the strap with the outer end of the convolute spring, and a'brake shoe pivota-lly secured to said casting and interposed between the cylindrical surface of the easing and the strap, said brake shoebeing adapted to be broughtintofrictional cont-act with the cylindrical surfaceof the casing by the tension upon the strap during therebound movement.

7. In a shock absorber the combination with a back plate or casting having an outwardly projecting post or stud, of a cylindrical casing rotatably mounted upon said post or stud, a convolute spring arranged within the casing and having its inner end rigidly connected to the post or stud, a strap having its lower end connected with the vehicle axle, the upper portion of said strap extending partly around the cylindrical casing the upper end of-said strap being con nected with the outer end of the convolute spring and a curved brake shoe pivot'ally and adjustably connected to the back plate or casting and adjacent to the cylindrical force said brake shoe into frictionalcontact with the cylindrical surface of the'casing upon the rebound movements of the vehicle and axle. v v

8. A shock absorber as set forth in claim 1 in which saidbrakefshoe is provided with one ormore rollers overwhich said strap extends.

9. A shock absorber as set forth in claim 5 in which said brake shoe is provided with .one or more rollers over which said strap extends.

signature.

' WILLIAM R DAY. 

